﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace StingBuilderExtTest
{
    class StrBuilderExtTest
    {
        static void Main(string[] args)
        {
            StringBuilder testSB = new StringBuilder("asdfasdf");
            StringBuilder subSB = testSB.Substring(3, 4);
            Console.WriteLine(subSB);
        }
    }
}
